Hey there, welcome to the community!
Follow the link below for the topic on how to apply. Before you apply though, make sure you meet the requirements. One of them is to be TL 1 or higher on the IFC. You can get this by hanging around, making meaningful posts, and by liking messages!
https://community.infiniteflight.com/t/atc-recruiting/843545
When you do apply, good luck, and may you keep our virtual skies safe!